a Canadian–American physics professor emeritus at the University of California, Berkeley and a faculty senior scientist emeritus at Lawrence Berkeley National Laboratory. A theoretical physicist, he was a member of the National Academy of Sciences, and is well known for numerous publications and summer-school lectures in nuclear and particle physics, as well as his widely used graduate text on classical electromagnetism.The book is notorious for the difficulty of its problems, and its tendency to treat non-obvious conclusions as self-evident. Jackson's high standards and admonitory vocabulary are the subject of an amusing memorial volume by his son Ian Jackson.